feat(leathercraft): ancient runic leather horse browband bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse browband bench, mithril rosette clasp tension rig, and celestial valkyrie temple sanctum engine for OpenAO MMORPG.

Features

• Horse browband bench catalog (Elder Browband Stitching Bench, Runic Ash Browband Rig, Celestial Void Valkyrie Temple Sanctum)
• Raw tanned buffalo browband straps and tempered mithril rosette clasp sets
• Novice equine headpiece browband and sovereign aerial browband recipes
• Independent steed bridle-stability ratings and willpower control ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped bridle stability bonus and willpower control scaling
• Upfront material deduction on all craft attempts to prevent zero-cost retries
• Consistent remainingProvidedLeathers arrays returned on all paths
• Immutable bench cloning pattern across craft and maintain functions
• Cached static catalog maxima and bench maintenance with durability threshold gating (DURABILITY_COST_PER_CRAFT = 10)
• 100% unit test coverage under Vitest (7/7 passing) with mid-range roll and durability gating verification

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